Fabrication of high-performance organic thin-film transistor arrays and application to 5-inch flexible displays

Y. Fujisaki, T. Takei, Y. Nakajima, H. Sato, M. Suzuki, H. Fukagawa, G. Motomura, D. Kumaki, T. Yamamoto, H. Fujikake, T. Kurita, S. Tokito

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We have demonstrated a 5-inch flexible color liquid crystal display (LCD) and organic light emitting display (OLED) driven by low-voltage-operation organic thin-film transistors (OTFTs). To achieve high-quality and high-resolution moving images, OTFTs with high performance, for example, high mobility, high ON/OFF ratio, low sub-threshold slope (SS), and low operating voltage, have been developed. We fabricated pentacene-based low-voltage OTFTs with a Ta2O5 gate dielectric prepared in a low-temperature process. The resulting OTFT array showed a high mobility of 0.3-0.4 cm 2/Vs, an ON/OFF ratio over 107, VT of 2.7 V, and low SS at 0.3 V/decade. OTFTs with solution-processable materials such as fluoropolymer gate dielectric and liquid-crystalline semiconducting polymers, PBTTT, were also investigated. The electrical characteristics and stabilities of these devices, as well as a demonstration of OTFT-driven flexible displays, are discussed. Both the flexible LC device and the OLED device were successfully fabricated on the pentacene-based OTFT arrays. Printing and lamination techniques were introduced to assemble the flexible LC device. Phosphorescent polymer materials, which can be patterned by ink-jet printing, were used for the emitting layer of the OLED. Color moving images were successively shown on the resulting 5-inch displays using an active-matrix driving technique of the OTFT at a low driving voltage of 15 V.

Original languageEnglish
Title of host publicationLarge-Area Processing and Patterning for Optical, Photovoltaic and Electronic Devices - 2009
Number of pages12
Publication statusPublished - 2010
Externally publishedYes
Event2009 MRS Fall Meeting - Boston, MA, United States
Duration: 2009 Nov 302009 Dec 4

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2009 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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